Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: sleuthhound 'dog used for tracking people' (14-20 centuries), from sleuth 'track' (12-15 centuries) (from Old Norse sloth) + hound

sleuth

 noun
     
sleuth [countable] old-fashioned
someone who tries to find out information about a crime [= detective]
—sleuthing noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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